VGAM (version 0.8-1)

MNSs: The MNSs Blood Group System

Description

Estimates the three independent parameters of the the MNSs blood group system.

Usage

MNSs(link = "logit", earg=list(), imS = NULL, ims = NULL, inS = NULL)

Arguments

link

Link function applied to the three parameters. See Links for more choices.

earg

List. Extra argument applied to each of the links. See earg in Links for general information.

imS, ims, inS

Optional initial value for mS, ms and nS respectively. A NULL means they are computed internally.

Value

• An object of class "vglmff" (see vglmff-class). The object is used by modelling functions such as vglm and vgam.

Details

There are three independent parameters: m_S, m_s, n_S, say, so that n_s = 1 - m_S - m_s - n_S. We let the eta vector (transposed) be (g(m_S), g(m_s), g(n_S)) where g is the link function.

References

Elandt-Johnson, R. C. (1971) Probability Models and Statistical Methods in Genetics, New York: Wiley.

See Also

AA.Aa.aa, AB.Ab.aB.ab, AB.Ab.aB.ab2, ABO, G1G2G3.

Examples

# Order matters only:
y = cbind(MS=295, Ms=107, MNS=379, MNs=322, NS=102, Ns=214) 
fit = vglm(y ~ 1, MNSs("logit", .25, .28, .08), trace=TRUE)
fit = vglm(y ~ 1, MNSs(link=logit), trace=TRUE, cri="coef")
Coef(fit) 
rbind(y, sum(y)*fitted(fit))
diag(vcov(fit))^0.5